Buy OEM 1991 Audi Part # 079905377F (079-905-377-F, 079905376A). Ignition Knock (Detonation) Sensor. Black. RS 5; Cylinders 5, 6. Knock Sensor - Repair or Replace A failed Knock Sensor will often have

Ignition Knock (Detonation) Sensor.
Cylinder 5,6. Ignition Knock (Detonation) Sensor.

Ignition Knock (Detonation) Sensor

Fits RS5

Black. RS 5; Cylinders 5, 6.
Knock Sensor - Repair or Replace
A failed Knock Sensor will often have no noticeable symptoms beyond a check engine light or engine ping or knock, but it does cause your 1991 Audi to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and Audi genuine parts.